Hi,
As this is a 2023 truck there should be no major issues. Initial thoughts could be a sensor moved or possibly a valve issue. In the UK Combilift has a specific technical team that work with all service personnel and will provide technical support. If you still need support, you can complete a quick technical support form at the bottom of the main combilift.com web site or direct link https://warranty.combilift.net/technical-support-form/. The form only asks for the minimal info so the team can quickly help you. There is no login required and no charge for this support.